CN113551302A - Multi-compressor refrigeration system and air conditioner - Google Patents
Multi-compressor refrigeration system and air conditioner Download PDFInfo
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- CN113551302A CN113551302A CN202110893149.7A CN202110893149A CN113551302A CN 113551302 A CN113551302 A CN 113551302A CN 202110893149 A CN202110893149 A CN 202110893149A CN 113551302 A CN113551302 A CN 113551302A
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 76
- 239000003507 refrigerant Substances 0.000 claims description 12
- 238000009434 installation Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/001—Compression cycle type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
- F25B41/24—Arrangement of shut-off valves for disconnecting a part of the refrigerant cycle, e.g. an outdoor part
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
- F25B41/42—Arrangements for diverging or converging flows, e.g. branch lines or junctions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
- F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B6/00—Compression machines, plants or systems, with several condenser circuits
- F25B6/02—Compression machines, plants or systems, with several condenser circuits arranged in parallel
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a multi-compressor refrigeration system and an air conditioner, wherein the multi-compressor refrigeration system comprises: the outdoor heat exchanger is provided with outdoor heat exchange tubes which correspond to the compressors one to one and are mutually independent, the indoor heat exchanger is provided with indoor heat exchange tubes which correspond to the compressors one to one and are mutually independent, a throttling element is connected between the outdoor heat exchanger and the indoor heat exchanger in series, each compressor and the corresponding outdoor heat exchange tube and the corresponding indoor heat exchange tube serve as a refrigeration loop, and the on-off state of the refrigeration loop, the opening degree of the throttling element, the fan rotating speed of the indoor heat exchanger and the fan rotating speed of the outdoor heat exchanger are controlled by a main control module. The invention has the advantages of low cost, freely switchable refrigeration loops and the like.
Description
Technical Field
The invention relates to the technical field of refrigeration systems, in particular to a multi-compressor refrigeration system and an air conditioner.
Background
At present, the air conditioner adopting double refrigeration systems is provided, the two refrigeration systems are arranged in the common double-system air conditioner and are not interfered with each other, the condensers and the evaporators of the two refrigeration systems are arranged independently, the installation space is large, the connecting pipeline of each condenser and each evaporator needs to be provided with a copper pipe, and the production cost of the air conditioner can be obviously increased for the market situation that the price of the copper pipe is higher and higher.
In addition, the working mode of the dual-system air conditioner is as follows: when the refrigeration demand reaches a certain degree, two compressors refrigerate the operation simultaneously, when the refrigeration demand is low, only one set of refrigerating system operates, under the long-term low refrigeration demand for an independent refrigerating system continuously operates, the heavy load of a single refrigerating system, and the service life is greatly shortened.
Therefore, how to reduce the production cost of many conventional dual refrigeration systems is an urgent technical problem to be solved in the industry.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a multi-compressor refrigeration system sharing a heat exchanger and an air conditioner.
The technical scheme adopted by the invention is that a multi-compressor refrigeration system is designed, and the multi-compressor refrigeration system comprises: the outdoor heat exchanger is provided with outdoor heat exchange tubes which are in one-to-one correspondence with the compressors and are mutually independent, the indoor heat exchanger is provided with indoor heat exchange tubes which are in one-to-one correspondence with the compressors and are mutually independent, and a throttling element is connected in series between the outdoor heat exchanger and the indoor heat exchanger.
An outdoor inlet valve is installed at one end of the outdoor heat exchange tube connected with the throttling element, an outdoor outlet valve is installed at the other end of the outdoor heat exchange tube, and an indoor valve is installed at one end of the indoor heat exchange tube connected with the throttling element. The outdoor heat exchange tube and the indoor heat exchange tube corresponding to the compressor are communicated when the compressor is started to operate, and the outdoor heat exchange tube and the indoor heat exchange tube corresponding to the compressor are closed when the compressor stops operating.
Preferably, the exhaust port of the compressor is connected in parallel to an exhaust line, and the outdoor heat exchange tube of the outdoor heat exchanger is connected in parallel to the outlet end of the exhaust line.
Preferably, each compressor and the corresponding outdoor heat exchange tube and indoor heat exchange tube thereof are used as a refrigeration loop, and the on-off state of the refrigeration loop, the opening degree of the throttling element, the fan rotating speed of the indoor heat exchanger and the fan rotating speed of the outdoor heat exchanger are controlled by the main control module.
Preferably, the main control module detects the indoor return air temperature, the number of the compressors needing to be started is judged according to the indoor return air temperature Th and the target temperature Ts, and the fan rotating speeds of the outdoor heat exchanger and the indoor heat exchanger are synchronously adjusted along with the number change of the started compressors. And the main control module calculates the temperature difference between the indoor return air temperature Th and the target temperature Ts, judges whether the temperature difference is less than a preset value Ty, starts a single compressor if the temperature difference is less than the preset value Ty, and starts at least two compressors if the temperature difference is not less than the preset value Ty.
Preferably, when there are at least two compressors operating at start-up, the opening degree of the throttling element is adjusted according to the average value of the target superheat degrees of the opened refrigeration circuits.
In some embodiments, the multi-compressor refrigeration system is provided with two compressors, when only one compressor is started to operate and the operation time exceeds the set single-machine time, the main control module starts the other compressor, after all the compressors simultaneously operate for the set on-line time, the firstly started compressor is closed, and then the started compressor continues to operate.
Furthermore, when only one compressor is started to operate and a refrigeration circuit where the started compressor is located has a fault, the main control module of the main control module closes the fault compressor, starts another compressor and shields the operation time of the other compressor, and the single compressor is kept to operate. When only one compressor is started to operate and the refrigerating circuit where the other compressor is located has a fault, the main control module shields the operation time of the started compressor and keeps the operation of the single compressor.
The invention also provides an air conditioner adopting the multi-compressor refrigeration system.
Compared with the prior art, the invention has the following beneficial effects:
1. only one set of outdoor heat exchanger and one set of indoor heat exchanger are adopted, and the outdoor heat exchanger and the indoor heat exchanger share one throttling element, so that pipelines are reduced, and the cost is effectively reduced;
2. the compressor is connected in parallel into a path after exhausting, the refrigerant enters the outdoor heat exchanger through a branch pipeline for condensation before entering the outdoor heat exchanger, the condensed refrigerant enters the compressor for compression respectively after being branched and throttled in the front of the indoor heat exchanger, and the pipelines are further reduced, and the cost is reduced;
3. refrigeration circuits with different compressors can be freely switched to operate alternately, so that the refrigeration requirements of users are met, and the service life of the unit is effectively guaranteed.
Drawings
The invention is described in detail below with reference to examples and figures, in which:
fig. 1 is a system connection diagram of two compressors according to the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The principles of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.
As shown in fig. 1, the multi-compressor refrigeration system of the present invention can be applied to a refrigeration device, such as an air conditioner or a refrigerator. The multi-compressor refrigerating system is provided with an outdoor heat exchanger 1, an indoor heat exchanger 7 and at least two compressors arranged in parallel, the outdoor heat exchanger 1 is provided with a plurality of outdoor heat exchange tubes and an outdoor heat exchanger fan 10, the outdoor heat exchange tubes are in the same number and one-to-one correspondence with the compressors, each outdoor heat exchange tube works independently, the indoor heat exchanger 7 is provided with a plurality of indoor heat exchange tubes and an indoor heat exchanger fan 9, the indoor heat exchange tubes are in the same number and one-to-one correspondence with the compressors, each indoor heat exchange tube works independently, an electric heater 8 is further arranged below each indoor heat exchange tube, and the electric heater 8 is located between each indoor heat exchange tube and the indoor heat exchanger fan 9. A throttling element 6 is connected in series between the outdoor heat exchanger 1 and the indoor heat exchanger 7, all outdoor heat exchange tubes are connected in parallel at one end of the throttling element 6, all indoor heat exchange tubes are connected in parallel at the other end of the throttling element 6, and the throttling element 6 can adopt an electronic expansion valve.
An outdoor inlet valve is arranged at one end of the outdoor heat exchange tube connected with the throttling element 6, an outdoor outlet valve is arranged at the other end of the outdoor heat exchange tube, and the outdoor heat exchange tube is switched to be switched on or off through the outdoor inlet valve and the outdoor outlet valve. An indoor valve is installed at one end of the indoor heat exchange tube connected with the throttling element 6, and the indoor heat exchange tube is switched to be connected or closed through the indoor valve.
It should be understood that the heat exchange tube or throttling element has only two ports, and the refrigerant flows into one port and flows out of the other port.
Each compressor and the corresponding outdoor heat exchange tube and the corresponding indoor heat exchange tube of the compressor are used as a refrigeration loop, the outdoor heat exchange tube and the indoor heat exchange tube of the refrigeration loop where the compressor is located are communicated when the compressor is started to operate, the corresponding outdoor heat exchange tube and the corresponding indoor heat exchanger are closed when the compressor stops operating, all the refrigeration loops share one set of outdoor heat exchanger 1 and one set of indoor heat exchanger 7, heat dissipation is controlled by one outdoor heat exchanger fan 10, air outlet is controlled by one indoor heat exchanger fan 8, and the refrigeration system is compact in structure and low in production cost. And the outdoor unit of the existing double-refrigeration system is designed in a split way, the installation space is large, the multi-compressor refrigeration system can save the installation space by sharing the outdoor heat exchanger, and can save pipeline welding and other complex installation procedures consumed during installation, and the stable operation of the system is ensured by reasonably controlling the flow of the pipeline refrigerant by sharing the throttling and throttling element.
Preferably, the exhaust port of the compressor is connected in parallel to an exhaust pipeline, the outdoor heat exchange tube in the outdoor heat exchanger 1 is connected in parallel to the outlet end of the exhaust pipeline, and the indoor heat exchange tubes of the indoor heat exchangers 7 are respectively connected to the air suction ports of the respective corresponding compressors. The connecting pipe at the outdoor side is combined into a pipeline by two pipelines of the existing double systems, so that the pipelines are further reduced, and the cost is reduced.
In order to realize the automatic switching of the refrigeration loop, the on-off state of the refrigeration loop, the opening degree of the throttling element 6 and the rotating speeds of the indoor heat exchanger fan 8 and the outdoor heat exchanger fan 10 are controlled by the main control module, the main control module detects the indoor return air temperature, the number of the compressors needing to be started is judged according to the indoor return air temperature Th and the target temperature Ts, the rotating speeds of the indoor heat exchanger fan 8 and the outdoor heat exchanger fan 10 are synchronously increased or reduced, and the rotating speeds of the fans are synchronously adjusted along with the change of the number of the started compressors, namely when the number of the started compressors is increased, the rotating speeds of the indoor heat exchanger fan 8 and the outdoor heat exchanger fan 10 are synchronously increased, and when the number of the started compressors is reduced, the rotating speeds of the indoor heat exchanger fan 8 and the outdoor heat exchanger fan 10 are synchronously reduced.
Specifically, the main control module calculates the temperature difference between the indoor return air temperature Th and the target temperature Ts, judges whether the temperature difference is smaller than a preset value Ty, and starts a single compressor if the temperature difference is smaller than the preset value Ty, or starts at least two compressors if the temperature difference is not smaller than the preset value Ty. When only one compressor is started to operate, the opening degree of the throttling element 6 is adjusted according to the target superheat degree of the started refrigeration loop, when at least two compressors are started to operate, the opening degree of the throttling element 6 is adjusted according to the average value of the target superheat degrees of the started refrigeration loop, so that the multi-compressor refrigeration system is maintained to operate stably, the operating frequency of the started compressors is always kept consistent, and the refrigerant flow of the pipelines is distributed more uniformly.
Preferably, when only one compressor is started to operate and the operation time exceeds the set single-machine time, the main control module starts the other compressor, and when all the compressors operate simultaneously to reach the set on-line time, the first started compressor is closed, and the later started compressor continues to operate, so that the state that only one compressor is started is recovered.
In some embodiments, as shown in fig. 1, the multi-compressor refrigeration system is provided with two compressors, and for the convenience of understanding, the two compressors and the corresponding components in the refrigeration circuit are distinguished by "first" and "second", when only the first compressor 13 is started to operate and the operation time exceeds the set unit time, the main control module starts the second compressor 14, the first compressor 13 is turned off after the two compressors are simultaneously operated to reach the set online time, the second compressor 14 is independently started to operate and the operation time exceeds the set unit time, the main control module starts the first compressor 13, the second compressor 14 is turned off after the two compressors are simultaneously operated to reach the set online time, and the two compressors are switched to operate alternatively according to the operation time.
In practical applications, the priorities of the first compressor 13 and the second compressor 14 may be designed, the first compressor 13 is used as a default compressor that is started with low demand, the set single-machine time and the set online time may be designed according to practical situations, for example, the set single-machine time is 240 hours, and the set online time is 3 minutes, the rotation speed of the indoor heat exchanger fan and the rotation speed regulation rule of the outdoor heat exchanger fan may be preset, for example, when both compressors are turned on, the wind speed is increased by a set proportion, and when only one compressor is turned on, the wind speed is decreased by a set proportion, which is merely described above as an example and is not used to limit the present invention.
The long-term low refrigeration demand condition, the operation of independent refrigeration circuit is unfavorable for life, and if a certain refrigeration circuit does not operate for a long time, probably lead to this refrigeration circuit's compressor can not normal start operation, control two refrigeration circuit's free switching replacement operation through the operating duration of single compressor of statistics, not only guaranteed user's refrigeration demand, also effectively ensured the life of unit simultaneously, though not reach energy-conservingly, avoided the later stage because of the maintenance risk that the trouble leads to for a long time does not operate.
Based on the embodiment that the multi-compressor refrigeration system is provided with two compressors, when only one compressor is started to operate and a refrigeration loop where the started compressor is positioned has a fault, the main control module of the main control module closes the fault compressor, starts the other compressor, automatically adjusts the opening of the throttling element according to the target superheat degree, shields the operation time of the other compressor, and always keeps the operation of a single compressor, namely when the operation time of the compressors exceeds the set single-machine time, the two compressors are not started at the same time. In addition, when only one compressor is started to operate and a refrigeration circuit where the other compressor is located breaks down, the main control module shields the operation time of the compressors and always keeps the operation of the single compressor, namely when the operation time of the compressors exceeds the set single-machine time, the two compressors are not started simultaneously.
As shown in fig. 1, the operation of the refrigeration system will be described in detail below, taking a two-compressor refrigeration system as an example.
And comparing the difference value between the indoor return air temperature Th and the target temperature Ts with a preset value Ty.
When Th-Ts is less than Ty, the main control module detects the refrigeration requirement and the refrigeration requirement is less, the first outdoor inlet valve 12, the first outdoor outlet valve 3 and the first indoor valve 4 are all opened to the maximum, the second outdoor inlet valve 11, the second outdoor outlet valve 2 and the second indoor valve 5 are all kept closed, the throttling element 6 is opened, the outdoor heat exchanger fan 10 is started, meanwhile, the first compressor 13 is started, the refrigerant is compressed by the first compressor 13 to increase enthalpy, then enters the outdoor heat exchanger 1 to exchange heat with outdoor air, the outdoor heat exchanger fan 10 replaces exhausted high-temperature air with lower relative temperature through operation, the cooled and condensed liquid refrigerant is throttled and depressurized through the throttling element 6, then enters the indoor heat exchanger 7, the air is driven by the indoor heat exchanger fan 9 to flow and exchange heat with the indoor air, and the refrigerant in the indoor heat exchanger 7 flows back to an air suction port of the first compressor 13 after heat exchange.
If the refrigeration requirement is continuously low, when the running time of the first compressor 13 exceeds the set single-machine time, the rotating speed of the outdoor heat exchanger fan 10 and the rotating speed of the indoor heat exchanger fan 9 are simultaneously increased, the second outdoor inlet valve 11, the second outdoor outlet valve 2 and the second indoor valve 5 are synchronously opened to the maximum, the second compressor 14 is simultaneously opened, the opening degree of the throttling element 6 is increased, after the two compressors simultaneously run to the set online time, the opening degree of the throttling element 6 is reduced, the first compressor 13 stops running, the rotating speed of the outdoor heat exchanger fan 10 and the rotating speed of the indoor heat exchanger fan 9 are simultaneously reduced, and then the first outdoor inlet valve 12, the first outdoor outlet valve 3 and the first indoor valve 4 are all closed, so that the refrigeration loop carried by the second compressor 14 can independently run for refrigeration.
When Th-Ts is larger than Ty, the main control module detects the refrigeration requirement and the refrigeration requirement is larger, if the first compressor 13 is started to operate, the outdoor heat exchanger fan 10 and the indoor heat exchanger fan 9 simultaneously increase the rotating speed, the second outdoor inlet valve 11, the second outdoor outlet valve 2 and the second indoor valve 5 are synchronously opened to the maximum, the second compressor 14 is started simultaneously, the opening degree of the throttling element 6 is increased, the main control module controls the opening degree of the throttling element by taking the target superheat degree average value of the two refrigeration loops as the final target superheat degree, so that the stable operation of the two refrigeration loops is maintained, the operating frequencies of the two compressors are always kept consistent, and the refrigerant flow of the pipelines is more uniformly distributed.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (11)
1. A multi-compressor refrigeration system comprising: the outdoor heat exchanger is provided with outdoor heat exchange tubes which are in one-to-one correspondence with the compressors and are mutually independent, the indoor heat exchanger is provided with indoor heat exchange tubes which are in one-to-one correspondence with the compressors and are mutually independent, and a throttling element is connected between the outdoor heat exchanger and the indoor heat exchanger in series.
2. The multi-compressor refrigeration system according to claim 1, wherein an outdoor inlet valve is installed at one end of the outdoor heat exchange tube connected to the throttling element, an outdoor outlet valve is installed at the other end of the outdoor heat exchange tube, and an indoor valve is installed at one end of the indoor heat exchange tube connected to the throttling element;
the outdoor heat exchange tube and the indoor heat exchange tube corresponding to the compressor are communicated when the compressor is started to operate, and the outdoor heat exchange tube and the indoor heat exchange tube corresponding to the compressor are closed when the compressor stops operating.
3. A multi-compressor refrigerant system as set forth in claim 1 wherein the discharge ports of the compressors are connected in parallel to a discharge line and the outdoor heat exchange tubes of the outdoor heat exchanger are connected in parallel to the outlet end of the discharge line.
4. The multi-compressor refrigeration system according to any one of claims 1 to 3, wherein each compressor and its corresponding outdoor heat exchange tube and indoor heat exchange tube are used as a refrigeration loop, and the on-off state of the refrigeration loop, the opening degree of the throttling element, the fan rotating speed of the indoor heat exchanger and the fan rotating speed of the outdoor heat exchanger are controlled by the main control module.
5. The multi-compressor refrigeration system according to claim 4, wherein the main control module detects an indoor return air temperature, the number of compressors to be started is determined according to the indoor return air temperature Th and a target temperature Ts, and the fan speeds of the outdoor heat exchanger and the indoor heat exchanger are synchronously adjusted along with the change of the number of the started compressors.
6. The multi-compressor refrigeration system as claimed in claim 5, wherein the main control module calculates a temperature difference between the indoor return air temperature Th and the target temperature Ts, determines whether the temperature difference is less than a preset value Ty, and turns on a single compressor if the temperature difference is less than the preset value Ty, and turns on at least two compressors if the temperature difference is not less than the preset value Ty.
7. The multiple compressor refrigeration system of claim 4 wherein the opening of the throttling element is adjusted based on an average of target superheat for the open refrigeration circuit when there are at least two compressors operating on.
8. The multi-compressor refrigeration system as claimed in claim 4, wherein the multi-compressor refrigeration system is provided with two compressors, when only one compressor is started to operate and the operation time exceeds the set single-machine time, the main control module starts the other compressor, and after all the compressors are simultaneously operated for the set on-line time, the firstly started compressor is closed, and then the secondly started compressor continues to operate.
9. The multi-compressor refrigeration system as claimed in claim 8, wherein when only one compressor is on and a refrigeration circuit in which the on-compressor is located has a fault, the main control module turns off the faulty compressor, turns on another compressor and shields the operation time of the other compressor, and always keeps the single compressor operating.
10. The multi-compressor refrigerant system of claim 8, wherein when only one compressor is on and the refrigerant circuit in which the other compressor is located fails, the main control module shields the on-compressor operation time and keeps the single compressor operating all the time.
11. Air conditioner characterized in that it employs a multiple compressor refrigeration system according to any of claims 1 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110893149.7A CN113551302B (en) | 2021-08-04 | Multi-compressor refrigerating system and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110893149.7A CN113551302B (en) | 2021-08-04 | Multi-compressor refrigerating system and air conditioner |
Publications (2)
| Publication Number | Publication Date |
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| CN113551302A true CN113551302A (en) | 2021-10-26 |
| CN113551302B CN113551302B (en) | 2024-10-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114719478A (en) * | 2022-04-13 | 2022-07-08 | 欧悦冰雪投资管理（北京）有限公司 | Control method and device for refrigeration device, electronic equipment and storage medium |
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